variant_add

Description

Adds left to right using
the following rules (taken from the MSDN library), which correspond to
those of Visual Basic:

Variant Addition Rules

If

Then

Both expressions are of the string type

Concatenation

One expression is a string type and the other a
character

Addition

One expression is numeric and the other is a string

Addition

Both expressions are numeric

Addition

Either expression is NULL

NULL is returned

Both expressions are empty

Integer subtype is returned

Parameters

left

The left operand.

right

The right operand.

Note:

As with all the variant arithmetic functions, the parameters for this function
can be either a PHP native type (integer, string, floating point, boolean or
NULL), or an instance of a COM, VARIANT or DOTNET class. PHP native types
will be converted to variants using the same rules as found in the constructor
for the VARIANT class. COM and DOTNET objects
will have the value of their default property taken and used as the variant value.

The variant arithmetic functions are wrappers around the similarly named
functions in the COM library; for more information on these functions, consult
the MSDN library. The PHP functions are named slightly differently; for example
variant_add() in PHP corresponds to VarAdd()
in the MSDN documentation.

Return Values

Returns the result.

See Also

variant_sub() - Subtracts the value of the right variant from the left variant value